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References: <0000000000009a318805e6ff48a4@google.com> <00000000000009570005f3f92b86@google.com>
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From:   Aleksandr Nogikh <nogikh@google.com>
Date:   Mon, 6 Feb 2023 11:20:48 +0100
Message-ID: <CANp29Y4vi+5X+3otv3JzWG9Ph=hVuUME9O+NZERsXvyZDq0z1Q@mail.gmail.com>
Subject: Re: [syzbot] [ntfs3?] BUG: unable to handle kernel NULL pointer
 dereference in ni_find_attr
To:     syzbot <syzbot+69d15cab6309bffae739@syzkaller.appspotmail.com>
Cc:     almaz.alexandrovich@paragon-software.com, edward.lo@ambergroup.io,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        ntfs3@lists.linux.dev, syzkaller-bugs@googlegroups.com,
        viro@zeniv.linux.org.uk
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On Sun, Feb 5, 2023 at 8:46 PM syzbot
<syzbot+69d15cab6309bffae739@syzkaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit 2681631c29739509eec59cc0b34e977bb04c6cf1
> Author: Edward Lo <edward.lo@ambergroup.io>
> Date:   Sat Aug 6 17:05:18 2022 +0000
>
>     fs/ntfs3: Add null pointer check to attr_load_runs_vcn
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=110ad78d480000
> start commit:   b7b275e60bcd Linux 6.1-rc7
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=2325e409a9a893e1
> dashboard link: https://syzkaller.appspot.com/bug?extid=69d15cab6309bffae739
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16b3fb9b880000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=101313bb880000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: fs/ntfs3: Add null pointer check to attr_load_runs_vcn

Looks correct.
#syz fix: fs/ntfs3: Add null pointer check to attr_load_runs_vcn

>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
>
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